<template>
  <div>
    <!--面包屑导航-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card>

      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!--表格区域-->
      <tree-table class="treeTable" :data="catelist"
                  :columns="columns"
                  :selection-type="false"
                  :expand-type="false"
                  show-index
                  index-text="#"
                  border
                  :show-row-hover="false"
      >
        <!--是否有效-->
        <template slot="isok" scope="scope">
          <i class="el-icon-success" style="color:lightgreen" v-if="scope.row.cat_deleted === false"></i>
          <i class="el-icon-error" style="color:lightgreen" v-else></i>
        </template>
        <!--排序-->
        <template slot="order" scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size="mini" v-else-if="scope.row.cat_level === 1" type="success">二级</el-tag>
          <el-tag size="mini" v-else type="warning">三级</el-tag>
        </template>
        <template slot="opt" scope="scope">
          <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
          <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
        </template>
      </tree-table>
      <!--分页区域-->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[5, 10, 20, 30]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total">
      </el-pagination>
    </el-card>
    <!--添加分类对话框-->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed">
      <el-form :model="addCateForm" :rules="addCateRules" ref="addCateRef" label-width="100px">
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <el-cascader
            v-model="selectKeys"
            :options="parentCateList"
            :props="props"
            @change="parentCateChange" clearable change-on-select></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
  export default {
    name: 'Cate',
    data() {
      return {
        //商品分类的数据列表，默认为空
        catelist: [],
        //查询条件
        queryInfo: {
          type: 3,
          pagenum: 1,
          pagesize: 5
        },
        //总数据条数
        total: 0,
        columns: [
          {
            label: '分类名称',
            prop: 'cat_name'
          },
          {
            label: '是否有效',
            prop: 'cat_deleted',
            type: 'template',//模板列
            template: 'isok'
          },
          {
            label: '排序',
            prop: 'cat_level',
            type: 'template',//模板列
            template: 'order'
          },
          {
            label: '操作',
            type: 'template',//模板列
            template: 'opt'
          }
        ],
        //控制添加分类对话框的显示与隐藏
        addCateDialogVisible: false,
        //添加分类的表单数据对象
        addCateForm: {
          cat_name: '',//分类名称
          cat_pid: 0,//父级分类
          cat_level: 0 //分类的等级
        },
        addCateRules: {
          cat_name: [
            { required: true, message: '请输入分类名称', trigger: 'blur' }
          ]
        },
        //父级分类的列表
        parentCateList: [],
        props: {
          expandTrigger: 'hover',
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        //选中的父级分类的id数组
        selectKeys: []


      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类失败')
        }
        console.log(res.data)
        this.catelist = res.data.result
        this.total = res.data.total
      },
      //监听pagesize改变的事件
      handleSizeChange(newSize) {
        this.queryInfo.pagesize = newSize
        this.getCateList()
      },
      //监听pagenum改变的事件
      handleCurrentChange(newPage) {
        this.queryInfo.pagenum = newPage
        this.getCateList()
      },
      //显示添加分类的对话框
      showAddCateDialog() {
        //获取父级分类列表
        this.getParentCateList()
        this.addCateDialogVisible = true
      },
      //获取父级分类的数据列表
      async getParentCateList() {
        const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取父级分类失败')
        }
        this.parentCateList = res.data

      },
      //选择项发生变化触发这个函数
      parentCateChange() {
        console.log(this.selectKeys)
        if (this.selectKeys.length > 0) {
          this.addCateForm.cat_pid = this.selectKeys[this.selectKeys.length - 1]
          this.addCateForm.cat_level = this.selectKeys.length
          return
        } else {
          this.addCateForm.cat_pid = 0
          this.addCateForm.cat_level = 0
        }
      },
      //添加新的分类
      addCate() {
        console.log(this.addCateForm)
        this.$refs.addCateRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post('categories', this.addCateForm)
          if (res.meta.status !== 201) {
            return this.$message.error('添加分类失败')
          }
          this.$message.success('添加分类成功')
          this.getCateList()
          this.addCateDialogVisible = false
        })
      },
      //监听添加分类对话框的关闭事件
      addCateDialogClosed() {
        this.$refs.addCateRef.resetFields()
        this.addCateForm.cat_level = 0
        this.addCateForm.cat_pid = 0
        this.selectKeys = []
      }


    }
  }
</script>

<style scoped lang="less">
  .treeTable {
    margin-top: 15px;
  }

  .el-cascader {
    width: 100%;


  }

</style>
